Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio
International audience We present a tracked orbit for a recently discovered 25th magnitude irregular moon of Saturn, using Canada-France-Hawaii Telescope imaging. Our 2 yr of observational arc on the moon leads to an orbit with a semimajor axis of 11.2 million kilometers and an inclination of 44 deg...
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Online Access: | https://hal.science/hal-03752464 https://hal.science/hal-03752464/document https://hal.science/hal-03752464/file/Ashton-etal_2022_PSJ_3_107.pdf https://doi.org/10.3847/psj/ac64a2 |
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ftinsu:oai:HAL:hal-03752464v1 2023-06-18T03:41:27+02:00 Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio Ashton, Edward Gladman, Brett Beaudoin, Matthew Alexandersen, Mike Petit, Jean-Marc University of British Columbia (UBC) Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC) 2022-05-13 https://hal.science/hal-03752464 https://hal.science/hal-03752464/document https://hal.science/hal-03752464/file/Ashton-etal_2022_PSJ_3_107.pdf https://doi.org/10.3847/psj/ac64a2 en eng HAL CCSD IOP Science info:eu-repo/semantics/altIdentifier/doi/10.3847/psj/ac64a2 hal-03752464 https://hal.science/hal-03752464 https://hal.science/hal-03752464/document https://hal.science/hal-03752464/file/Ashton-etal_2022_PSJ_3_107.pdf doi:10.3847/psj/ac64a2 info:eu-repo/semantics/OpenAccess ISSN: 2632-3338 The Planetary Science Journal https://hal.science/hal-03752464 The Planetary Science Journal, 2022, 3, ⟨10.3847/psj/ac64a2⟩ [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.3847/psj/ac64a2 2023-06-05T20:13:01Z International audience We present a tracked orbit for a recently discovered 25th magnitude irregular moon of Saturn, using Canada-France-Hawaii Telescope imaging. Our 2 yr of observational arc on the moon leads to an orbit with a semimajor axis of 11.2 million kilometers and an inclination of 44 deg. This makes it one of the smallest Saturnian irregular moon orbits known and puts the moon in the Inuit group. This moon is also a magnitude brighter than the faintest known Saturnian irregulars. We show that the moon's small semimajor axis results in it spending most of the time lost in the glare of the often-nearby planet, thus explaining how it escaped detection in previous surveys. We postulate that the disparity in the known inventory with more retrograde than direct irregular moons is partly due to the selection bias against finding the direct moons (whose groupings have smaller semimajor axis). Unified Astronomy Thesaurus concepts: Irregular satellites (2027); Saturnian satellites (1427); Natural satellites (Solar system) (1089); Saturn (1426) Article in Journal/Newspaper inuit Institut national des sciences de l'Univers: HAL-INSU Canada Saturn ENVELOPE(156.040,156.040,62.067,62.067) The Planetary Science Journal 3 5 107 |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] |
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[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Ashton, Edward Gladman, Brett Beaudoin, Matthew Alexandersen, Mike Petit, Jean-Marc Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio |
topic_facet |
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] |
description |
International audience We present a tracked orbit for a recently discovered 25th magnitude irregular moon of Saturn, using Canada-France-Hawaii Telescope imaging. Our 2 yr of observational arc on the moon leads to an orbit with a semimajor axis of 11.2 million kilometers and an inclination of 44 deg. This makes it one of the smallest Saturnian irregular moon orbits known and puts the moon in the Inuit group. This moon is also a magnitude brighter than the faintest known Saturnian irregulars. We show that the moon's small semimajor axis results in it spending most of the time lost in the glare of the often-nearby planet, thus explaining how it escaped detection in previous surveys. We postulate that the disparity in the known inventory with more retrograde than direct irregular moons is partly due to the selection bias against finding the direct moons (whose groupings have smaller semimajor axis). Unified Astronomy Thesaurus concepts: Irregular satellites (2027); Saturnian satellites (1427); Natural satellites (Solar system) (1089); Saturn (1426) |
author2 |
University of British Columbia (UBC) Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC) |
format |
Article in Journal/Newspaper |
author |
Ashton, Edward Gladman, Brett Beaudoin, Matthew Alexandersen, Mike Petit, Jean-Marc |
author_facet |
Ashton, Edward Gladman, Brett Beaudoin, Matthew Alexandersen, Mike Petit, Jean-Marc |
author_sort |
Ashton, Edward |
title |
Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio |
title_short |
Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio |
title_full |
Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio |
title_fullStr |
Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio |
title_full_unstemmed |
Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio |
title_sort |
discovery of the closest saturnian irregular moon, s/2019 s 1, and implications for the direct/retrograde satellite ratio |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03752464 https://hal.science/hal-03752464/document https://hal.science/hal-03752464/file/Ashton-etal_2022_PSJ_3_107.pdf https://doi.org/10.3847/psj/ac64a2 |
long_lat |
ENVELOPE(156.040,156.040,62.067,62.067) |
geographic |
Canada Saturn |
geographic_facet |
Canada Saturn |
genre |
inuit |
genre_facet |
inuit |
op_source |
ISSN: 2632-3338 The Planetary Science Journal https://hal.science/hal-03752464 The Planetary Science Journal, 2022, 3, ⟨10.3847/psj/ac64a2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3847/psj/ac64a2 hal-03752464 https://hal.science/hal-03752464 https://hal.science/hal-03752464/document https://hal.science/hal-03752464/file/Ashton-etal_2022_PSJ_3_107.pdf doi:10.3847/psj/ac64a2 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3847/psj/ac64a2 |
container_title |
The Planetary Science Journal |
container_volume |
3 |
container_issue |
5 |
container_start_page |
107 |
_version_ |
1769007050947297280 |